The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 2000
Filed:
Dec. 02, 1996
Ravi Kumar Arimilli, Austin, TX (US);
John Michael Kaiser, Cedar Park, TX (US);
Warren Edward Maule, Cedar Park, TX (US);
International Business Machines Corp., Armonk, NY (US);
Abstract
In multi-processor systems which have separated the system bus from the I/O bus, a Shadow Directory is introduced into the memory controller for reducing bottlenecks that occur from the processors snooping data cache in the I/O devices residing on the I/O bus. This Shadow Directory is advantageously employed in a system, such as the PowerPc architecture which distinguishes between the types of data that can be cached in I/O devices. The Shadow Directory uses two First In First Out (FIFO) stacks for two different types of data. These FIFO stacks are then used for addresses placed on the system bus and I/O bus in order to reduce snoop latency times.